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<h2><span class="refentrytitle">Function template type_id_runtime</span></h2>
<p>boost::typeindex::type_id_runtime</p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../boost_typeindex_header_reference.html#header.boost.type_index_hpp" title="Header &lt;boost/type_index.hpp&gt;">boost/type_index.hpp</a>&gt;

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<span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> T<span class="special">&gt;</span> <span class="identifier">type_index</span> <span class="identifier">type_id_runtime</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">T</span> <span class="special">&amp;</span> runtime_val<span class="special">)</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.43.8.2.10.4"></a><h2>Description</h2>
<p>Function that works exactly like C++ typeid(rtti_val) call, but returns boost::type_index.</p>
<p>Returns runtime information about specified type.</p>
<p><span class="bold"><strong>Requirements:</strong></span> RTTI available or Base and Derived classes must be marked with BOOST_TYPE_INDEX_REGISTER_CLASS.</p>
<p><span class="bold"><strong>Example:</strong></span> </p>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">Base</span> <span class="special">{</span> <span class="keyword">virtual</span> <span class="special">~</span><span class="identifier">Base</span><span class="special">(</span><span class="special">)</span><span class="special">{</span><span class="special">}</span> <span class="special">}</span><span class="special">;</span>
<span class="keyword">struct</span> <span class="identifier">Derived</span><span class="special">:</span> <span class="keyword">public</span> <span class="identifier">Base</span>  <span class="special">{</span><span class="special">}</span><span class="special">;</span>
<span class="special">...</span>
<span class="identifier">Derived</span> <span class="identifier">d</span><span class="special">;</span>
<span class="identifier">Base</span><span class="special">&amp;</span> <span class="identifier">b</span> <span class="special">=</span> <span class="identifier">d</span><span class="special">;</span>
<span class="identifier">type_index</span> <span class="identifier">ti</span> <span class="special">=</span> <span class="identifier">type_id_runtime</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">ti</span><span class="special">.</span><span class="identifier">pretty_name</span><span class="special">(</span><span class="special">)</span><span class="special">;</span>  <span class="comment">// Outputs 'Derived'</span>
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<td><p><span class="term">Parameters:</span></p></td>
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<td><p><span class="term"><code class="computeroutput">runtime_val</code></span></p></td>
<td><p>Variable which runtime type must be returned. </p></td>
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<td><p><span class="term">Returns:</span></p></td>
<td><p>boost::typeindex::type_index with information about the specified variable. </p></td>
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<td><p><span class="term">Throws:</span></p></td>
<td>Nothing. </td>
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<td align="right"><div class="copyright-footer">Copyright © 2012-2021 Antony Polukhin<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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